lvm2/lib/metadata/lv.c

/*
 * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
 * Copyright (C) 2004-2010 Red Hat, Inc. All rights reserved.
 *
 * This file is part of LVM2.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License v.2.1.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "lib.h"
#include "metadata.h"
#include "display.h"
#include "activate.h"
#include "toolcontext.h"
#include "segtype.h"
#include "str_list.h"

static char *_format_pvsegs(struct dm_pool *mem, const struct lv_segment *seg,
			     int range_format)
{
	unsigned int s;
	const char *name = NULL;
	uint32_t extent = 0;
	char extent_str[32];

	if (!dm_pool_begin_object(mem, 256)) {
		log_error("dm_pool_begin_object failed");
		return NULL;
	}

	for (s = 0; s < seg->area_count; s++) {
		switch (seg_type(seg, s)) {
		case AREA_LV:
			name = seg_lv(seg, s)->name;
			extent = seg_le(seg, s);
			break;
		case AREA_PV:
			name = dev_name(seg_dev(seg, s));
			extent = seg_pe(seg, s);
			break;
		case AREA_UNASSIGNED:
			name = "unassigned";
			extent = 0;
		}

		if (!dm_pool_grow_object(mem, name, strlen(name))) {
			log_error("dm_pool_grow_object failed");
			return NULL;
		}

		if (dm_snprintf(extent_str, sizeof(extent_str),
				"%s%" PRIu32 "%s",
				range_format ? ":" : "(", extent,
				range_format ? "-"  : ")") < 0) {
			log_error("Extent number dm_snprintf failed");
			return NULL;
		}
		if (!dm_pool_grow_object(mem, extent_str, strlen(extent_str))) {
			log_error("dm_pool_grow_object failed");
			return NULL;
		}

		if (range_format) {
			if (dm_snprintf(extent_str, sizeof(extent_str),
					"%" PRIu32, extent + seg->area_len - 1) < 0) {
				log_error("Extent number dm_snprintf failed");
				return NULL;
			}
			if (!dm_pool_grow_object(mem, extent_str, strlen(extent_str))) {
				log_error("dm_pool_grow_object failed");
				return NULL;
			}
		}

		if ((s != seg->area_count - 1) &&
		    !dm_pool_grow_object(mem, range_format ? " " : ",", 1)) {
			log_error("dm_pool_grow_object failed");
			return NULL;
		}
	}

	if (!dm_pool_grow_object(mem, "\0", 1)) {
		log_error("dm_pool_grow_object failed");
		return NULL;
	}

	return dm_pool_end_object(mem);
}

char *lvseg_devices(struct dm_pool *mem, const struct lv_segment *seg)
{
	return _format_pvsegs(mem, seg, 0);
}

char *lvseg_seg_pe_ranges(struct dm_pool *mem, const struct lv_segment *seg)
{
	return _format_pvsegs(mem, seg, 1);
}

char *lvseg_tags_dup(const struct lv_segment *seg)
{
	return tags_format_and_copy(seg->lv->vg->vgmem, &seg->tags);
}

char *lvseg_segtype_dup(struct dm_pool *mem, const struct lv_segment *seg)
{
	if (seg->area_count == 1) {
		return (char *)"linear";
	}

	return dm_pool_strdup(mem, seg->segtype->ops->name(seg));
}

uint64_t lvseg_chunksize(const struct lv_segment *seg)
{
	uint64_t size;

	if (lv_is_cow(seg->lv))
		size = (uint64_t) find_cow(seg->lv)->chunk_size;
	else
		size = UINT64_C(0);
	return size;
}

uint64_t lvseg_start(const struct lv_segment *seg)
{
	return (uint64_t) seg->le * seg->lv->vg->extent_size;
}

uint64_t lvseg_size(const struct lv_segment *seg)
{
	return (uint64_t) seg->len * seg->lv->vg->extent_size;
}

uint32_t lv_kernel_read_ahead(const struct logical_volume *lv)
{
	struct lvinfo info;

	if (!lv_info(lv->vg->cmd, lv, 0, &info, 0, 1) || !info.exists)
		return UINT32_MAX;
	return info.read_ahead;
}

char *lv_origin_dup(struct dm_pool *mem, const struct logical_volume *lv)
{
	if (lv_is_cow(lv))
		return lv_name_dup(mem, origin_from_cow(lv));
	return NULL;
}

char *lv_name_dup(struct dm_pool *mem, const struct logical_volume *lv)
{
	return dm_pool_strdup(mem, lv->name);
}

char *lv_modules_dup(struct dm_pool *mem, const struct logical_volume *lv)
{
	struct dm_list *modules;

	if (!(modules = str_list_create(mem))) {
		log_error("modules str_list allocation failed");
		return NULL;
	}

	if (!list_lv_modules(mem, lv, modules))
		return_NULL;
	return tags_format_and_copy(mem, modules);
}

char *lv_mirror_log_dup(struct dm_pool *mem, const struct logical_volume *lv)
{
	struct lv_segment *seg;

	dm_list_iterate_items(seg, &lv->segments) {
		if (!seg_is_mirrored(seg) || !seg->log_lv)
			continue;
		return dm_pool_strdup(mem, seg->log_lv->name);
	}
	return NULL;
}

int lv_kernel_minor(const struct logical_volume *lv)
{
	struct lvinfo info;

	if (lv_info(lv->vg->cmd, lv, 0, &info, 0, 0) && info.exists)
		return info.minor;
	return -1;
}

int lv_kernel_major(const struct logical_volume *lv)
{
	struct lvinfo info;
	if (lv_info(lv->vg->cmd, lv, 0, &info, 0, 0) && info.exists)
		return info.major;
	return -1;
}

char *lv_convert_lv_dup(struct dm_pool *mem, const struct logical_volume *lv)
{
	struct lv_segment *seg;

	if (lv->status & (CONVERTING|MIRRORED)) {
		seg = first_seg(lv);

		/* Temporary mirror is always area_num == 0 */
		if (seg_type(seg, 0) == AREA_LV &&
		    is_temporary_mirror_layer(seg_lv(seg, 0)))
			return dm_pool_strdup(mem, seg_lv(seg, 0)->name);
	}
	return NULL;
}

char *lv_move_pv_dup(struct dm_pool *mem, const struct logical_volume *lv)
{
	struct lv_segment *seg;

	dm_list_iterate_items(seg, &lv->segments) {
		if (seg->status & PVMOVE)
			return dm_pool_strdup(mem, dev_name(seg_dev(seg, 0)));
	}
	return NULL;
}

uint64_t lv_origin_size(const struct logical_volume *lv)
{
	if (lv_is_cow(lv))
		return (uint64_t) find_cow(lv)->len * lv->vg->extent_size;
	if (lv_is_origin(lv))
		return lv->size;
	return 0;
}

char *lv_path_dup(struct dm_pool *mem, const struct logical_volume *lv)
{
	char *repstr;
	size_t len;

	if (!*lv->vg->name)
		return dm_pool_strdup(mem, "");

	len = strlen(lv->vg->cmd->dev_dir) + strlen(lv->vg->name) +
		strlen(lv->name) + 2;

	if (!(repstr = dm_pool_zalloc(mem, len))) {
		log_error("dm_pool_alloc failed");
		return 0;
	}

	if (dm_snprintf(repstr, len, "%s%s/%s",
			lv->vg->cmd->dev_dir, lv->vg->name, lv->name) < 0) {
		log_error("lvpath snprintf failed");
		return 0;
	}

	return repstr;
}

char *lv_uuid_dup(const struct logical_volume *lv)
{
	return id_format_and_copy(lv->vg->vgmem, &lv->lvid.id[1]);
}

char *lv_tags_dup(const struct logical_volume *lv)
{
	return tags_format_and_copy(lv->vg->vgmem, &lv->tags);
}

uint64_t lv_size(const struct logical_volume *lv)
{
	return lv->size;
}

static int _lv_mimage_in_sync(const struct logical_volume *lv)
{
	percent_t percent;
	struct lv_segment *mirror_seg = find_mirror_seg(first_seg(lv));

	if (!(lv->status & MIRROR_IMAGE) || !mirror_seg)
		return_0;

	if (!lv_mirror_percent(lv->vg->cmd, mirror_seg->lv, 0, &percent,
			       NULL))
		return_0;

	return (percent == PERCENT_100) ? 1 : 0;
}

char *lv_attr_dup(struct dm_pool *mem, const struct logical_volume *lv)
{
	percent_t snap_percent;
	struct lvinfo info;
	char *repstr;

	if (!(repstr = dm_pool_zalloc(mem, 7))) {
		log_error("dm_pool_alloc failed");
		return 0;
	}

	/* Blank if this is a "free space" LV. */
	if (!*lv->name)
		goto out;

	if (lv->status & PVMOVE)
		repstr[0] = 'p';
	else if (lv->status & CONVERTING)
		repstr[0] = 'c';
	else if (lv->status & VIRTUAL)
		repstr[0] = 'v';
	/* Origin takes precedence over Mirror */
	else if (lv_is_origin(lv)) {
		repstr[0] = (lv_is_merging_origin(lv)) ? 'O' : 'o';
	}
	else if (lv->status & MIRRORED) {
		repstr[0] = (lv->status & LV_NOTSYNCED) ? 'M' : 'm';
	}else if (lv->status & MIRROR_IMAGE)
		repstr[0] = (_lv_mimage_in_sync(lv)) ? 'i' : 'I';
	else if (lv->status & MIRROR_LOG)
		repstr[0] = 'l';
	else if (lv_is_cow(lv)) {
		repstr[0] = (lv_is_merging_cow(lv)) ? 'S' : 's';
	} else
		repstr[0] = '-';

	if (lv->status & PVMOVE)
		repstr[1] = '-';
	else if (lv->status & LVM_WRITE)
		repstr[1] = 'w';
	else if (lv->status & LVM_READ)
		repstr[1] = 'r';
	else
		repstr[1] = '-';

	repstr[2] = alloc_policy_char(lv->alloc);

	if (lv->status & LOCKED)
		repstr[2] = toupper(repstr[2]);

	repstr[3] = (lv->status & FIXED_MINOR) ? 'm' : '-';

	if (lv_info(lv->vg->cmd, lv, 0, &info, 1, 0) && info.exists) {
		if (info.suspended)
			repstr[4] = 's';	/* Suspended */
		else if (info.live_table)
			repstr[4] = 'a';	/* Active */
		else if (info.inactive_table)
			repstr[4] = 'i';	/* Inactive with table */
		else
			repstr[4] = 'd';	/* Inactive without table */

		/* Snapshot dropped? */
		if (info.live_table && lv_is_cow(lv) &&
		    (!lv_snapshot_percent(lv, &snap_percent) ||
		     snap_percent == PERCENT_INVALID)) {
			repstr[0] = toupper(repstr[0]);
			if (info.suspended)
				repstr[4] = 'S'; /* Susp Inv snapshot */
			else
				repstr[4] = 'I'; /* Invalid snapshot */
		}

		repstr[5] = (info.open_count) ? 'o' : '-';
	} else {
		repstr[4] = '-';
		repstr[5] = '-';
	}
out:
	return repstr;
}